Sunday, May 4, 2008
3-47
Lime pretreatment of sugarcane bagasse for fuel bioethanol production
Sarita C. Rabelo, Rubens Maciel Filho, and Aline C. Costa. Department of Chemical Process – School of Chemical Engineering, State University of Campinas, Cidade Universitária, Campinas, Brazil
In the last years there is a great deal of interest in the utilization of lignocellulosic materials as renewable resources for production of fuel ethanol. Among lignocellulosic materials, the use of agricultural residues has also the benefit of disposal of problematic solid wastes which usually presents few economic alternatives. One of the major lignocellulosic materials to be considered in tropical countries, as Brazil, is sugarcane bagasse.
In this work the pretreatment of sugar cane bagasse with lime (calcium hydroxide) is evaluated. The effect of lime pretreatment on digestibility was studied through analyses using a complete 23 factorial design, considering pretreatment time, temperature and lime loading as factors. The responses evaluated were the yield of total reducing sugars (TRS) and glucose released from pretreated bagasse after enzymatic hydrolysis. Experiments were performed using the bagasse, as it comes from an alcohol/sugar factory (non-screened bagasse) and bagasse; in the size range from 0.248 to 1.397 mm (screened bagasse) (12-60 mesh). It was observed that the particle size presented weak influence in the release of fermentable sugars after enzymatic hydrolysis using low loading of cellulase and b-glucosidase (3.5 FPU/g dry pretreated biomass and 1.0 IU/g dry pretreated biomass, respectively).
The optimal pretreatment conditions were determined for non-screened bagasse since the preliminary results for pretreatments of non-screened bagasse and for screened bagasse were not very different. As screening is an expensive unit operation, the use of non-screened bagasse was preferred. Analyses were performed using central composite (response surface) to determine the optimal conditions.
In this work the pretreatment of sugar cane bagasse with lime (calcium hydroxide) is evaluated. The effect of lime pretreatment on digestibility was studied through analyses using a complete 23 factorial design, considering pretreatment time, temperature and lime loading as factors. The responses evaluated were the yield of total reducing sugars (TRS) and glucose released from pretreated bagasse after enzymatic hydrolysis. Experiments were performed using the bagasse, as it comes from an alcohol/sugar factory (non-screened bagasse) and bagasse; in the size range from 0.248 to 1.397 mm (screened bagasse) (12-60 mesh). It was observed that the particle size presented weak influence in the release of fermentable sugars after enzymatic hydrolysis using low loading of cellulase and b-glucosidase (3.5 FPU/g dry pretreated biomass and 1.0 IU/g dry pretreated biomass, respectively).
The optimal pretreatment conditions were determined for non-screened bagasse since the preliminary results for pretreatments of non-screened bagasse and for screened bagasse were not very different. As screening is an expensive unit operation, the use of non-screened bagasse was preferred. Analyses were performed using central composite (response surface) to determine the optimal conditions.
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See more of The 30th Symposium on Biotechnology for Fuels and Chemicals (May 4 -- 7, 2008)
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See more of The 30th Symposium on Biotechnology for Fuels and Chemicals (May 4 -- 7, 2008)